寻找成本优化的星际飞船
Searching for Cost Optimized Interstellar Beacons
摘要：
如果由具有各种动机的文明建造，SETI信标发射器会是什么样子，但谁在乎成本呢？我们在一篇配套论文中研究了如何在远场固定功率密度的情况下，建立一个成本最优的星际信标系统。在这里，我们考虑，如果有人像我们一样产生一个信标，我们应该如何寻找它？除了双向通信之外，高功率发射机还可以用于各种各样的目的;为了在数千光年之外被看到而建造的望远镜就是这样。利他主义的灯塔建设者将不得不与其他利他主义的原因，就像人类一样，所以可能会选择经济的努力。成本，谱线接近1千兆赫和星际闪烁有利于辐射频率大大高于经典的水洞。因此，对于遥远的、有成本意识的信标的传输策略将是快速扫描银河平面，以覆盖角空间。这样的脉冲对于接收机来说将是罕见的事件。这种由遥远的先进富裕社会建造的太空堡垒，将与SETI研究人员所寻求的有着非常不同的特征。未来的搜索应该特别注意沿着银河盘的区域，SETI搜索已经看到了相干信号，这些信号在我们使用的有限的监听时间间隔内没有出现。我们将需要等待可能以间歇性爆发的形式出现的重复事件。从这些想法中产生了几种新的SETI搜索策略。我们基于生命平面假设提出了一种新的SETI信标测试。
英文摘要：
What would SETI Beacon transmitters be like if built by civilizations with a variety of motivations, but who cared about cost? We studied in a companion paper how, for fixed power density in the far field, we could build a cost-optimum interstellar Beacon system. Here we consider, if someone like us were to produce a Beacon, how should we look for it? High-power transmitters might be built for wide variety of motives other than twoway communication; Beacons built to be seen over thousands of light years are such. Altruistic Beacon builders will have to contend with other altruistic causes, just as humans do, so may select for economy of effort. Cost, spectral lines near 1 GHz and interstellar scintillation favor radiating frequencies substantially above the classic water hole. Therefore the transmission strategy for a distant, cost-conscious Beacon will be a rapid scan of the galactic plane, to cover the angular space. Such pulses will be infrequent events for the receiver. Such Beacons built by distant advanced, wealthy societies will have very different characteristics from what SETI researchers seek. Future searches should pay special attention to areas along the galactic disk where SETI searches have seen coherent signals that have not recurred on the limited listening time intervals we have used. We will need to wait for recurring events that may arrive in intermittent bursts. Several new SETI search strategies emerge from these ideas. We propose a new test for SETI Beacons, based on the Life Plane hypotheses.
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